text: # coding: utf-8
  from __future__ import unicode_literals
  
  from hashlib import md5
  from base64 import b64encode
  from datetime import datetime
  import re
  
  from .common import InfoExtractor
  from ..compat import (
      compat_urllib_parse_urlencode,
      compat_str,
      compat_itertools_count,
  )
  from ..utils import (
      sanitized_Request,
      float_or_none,
  )
  
  
  class NetEaseMusicBaseIE(InfoExtractor):
      _FORMATS = ['bMusic', 'mMusic', 'hMusic']
      _NETEASE_SALT = '3go8&$8*3*3h0k(2)2'
      _API_BASE = 'http://music.163.com/api/'
  
      @classmethod
      def _encrypt(cls, dfsid):
          salt_bytes = bytearray(cls._NETEASE_SALT.encode('utf-8'))
          string_bytes = bytearray(compat_str(dfsid).encode('ascii'))
          salt_len = len(salt_bytes)
          for i in range(len(string_bytes)):
              string_bytes[i] = string_bytes[i] ^ salt_bytes[i % salt_len]
          m = md5()
          m.update(bytes(string_bytes))
          result = b64encode(m.digest()).decode('ascii')
          return result.replace('/', '_').replace('+', '-')
  
      def extract_formats(self, info):
          formats = []
          for song_format in self._FORMATS:
              details = info.get(song_format)
              if not details:
                  continue
              song_file_path = '/%s/%s.%s' % (
                  self._encrypt(details['dfsId']), details['dfsId'], details['extension'])
  
              # 203.130.59.9, 124.40.233.182, 115.231.74.139, etc is a reverse proxy-like feature
              # from NetEase's CDN provider that can be used if m5.music.126.net does not
              # work, especially for users outside of Mainland China
              # via: https://github.com/JixunMoe/unblock-163/issues/3#issuecomment-163115880
              for host in ('http://m5.music.126.net', 'http://115.231.74.139/m1.music.126.net',
                           'http://124.40.233.182/m1.music.126.net', 'http://203.130.59.9/m1.music.126.net'):
                  song_url = host + song_file_path
                  if self._is_valid_url(song_url, info['id'], 'song'):
                      formats.append({
                          'url': song_url,
                          'ext': details.get('extension'),
                          'abr': float_or_none(details.get('bitrate'), scale=1000),
                          'format_id': song_format,
                          'filesize': details.get('size'),
                          'asr': details.get('sr')
                      })
                      break
          return formats
  
      @classmethod
      def convert_milliseconds(cls, ms):
          return int(round(ms / 1000.0))
  
      def query_api(self, endpoint, video_id, note):
          req = sanitized_Request('%s%s' % (self._API_BASE, endpoint))
          req.add_header('Referer', self._API_BASE)
          return self._download_json(req, video_id, note)
  
  
  class NetEaseMusicIE(NetEaseMusicBaseIE):
      IE_NAME = 'netease:song'
      IE_DESC = '网易云音乐'
      _VALID_URL = r'https?://music\.163\.com/(#/)?song\?id=(?P<id>[0-9]+)'
      _TESTS = [{
          'url': 'http://music.163.com/#/song?id=32102397',
          'md5': 'f2e97280e6345c74ba9d5677dd5dcb45',
          'info_dict': {
              'id': '32102397',
              'ext': 'mp3',
              'title': 'Bad Blood (feat. Kendrick Lamar)',
              'creator': 'Taylor Swift / Kendrick Lamar',
              'upload_date': '20150517',
              'timestamp': 1431878400,
              'description': 'md5:a10a54589c2860300d02e1de821eb2ef',
          },
          'skip': 'Blocked outside Mainland China',
      }, {
          'note': 'No lyrics translation.',
          'url': 'http://music.163.com/#/song?id=29822014',
          'info_dict': {
              'id': '29822014',
              'ext': 'mp3',
              'title': '听见下雨的声音',
              'creator': '周杰伦',
              'upload_date': '20141225',
              'timestamp': 1419523200,
              'description': 'md5:a4d8d89f44656af206b7b2555c0bce6c',
          },
          'skip': 'Blocked outside Mainland China',
      }, {
          'note': 'No lyrics.',
          'url': 'http://music.163.com/song?id=17241424',
          'info_dict': {
              'id': '17241424',
              'ext': 'mp3',
              'title': 'Opus 28',
              'creator': 'Dustin O\'Halloran',
              'upload_date': '20080211',
              'timestamp': 1202745600,
          },
          'skip': 'Blocked outside Mainland China',
      }, {
          'note': 'Has translated name.',
          'url': 'http://music.163.com/#/song?id=22735043',
          'info_dict': {
              'id': '22735043',
              'ext': 'mp3',
              'title': '소원을 말해봐 (Genie)',
              'creator': '少女时代',
              'description': 'md5:79d99cc560e4ca97e0c4d86800ee4184',
              'upload_date': '20100127',
              'timestamp': 1264608000,
              'alt_title': '说出愿望吧(Genie)',
          },
          'skip': 'Blocked outside Mainland China',
      }]
  
      def _process_lyrics(self, lyrics_info):
          original = lyrics_info.get('lrc', {}).get('lyric')
          translated = lyrics_info.get('tlyric', {}).get('lyric')
  
          if not translated:
              return original
  
          lyrics_expr = r'(\[[0-9]{2}:[0-9]{2}\.[0-9]{2,}\])([^\n]+)'
          original_ts_texts = re.findall(lyrics_expr, original)
          translation_ts_dict = dict(
              (time_stamp, text) for time_stamp, text in re.findall(lyrics_expr, translated)
          )
          lyrics = '\n'.join([
              '%s%s / %s' % (time_stamp, text, translation_ts_dict.get(time_stamp, ''))
              for time_stamp, text in original_ts_texts
          ])
          return lyrics
  
      def _real_extract(self, url):
          song_id = self._match_id(url)
  
          params = {
              'id': song_id,
              'ids': '[%s]' % song_id
          }
          info = self.query_api(
              'song/detail?' + compat_urllib_parse_urlencode(params),
              song_id, 'Downloading song info')['songs'][0]
  
          formats = self.extract_formats(info)
          self._sort_formats(formats)
  
          lyrics_info = self.query_api(
              'song/lyric?id=%s&lv=-1&tv=-1' % song_id,
              song_id, 'Downloading lyrics data')
          lyrics = self._process_lyrics(lyrics_info)
  
          alt_title = None
          if info.get('transNames'):
              alt_title = '/'.join(info.get('transNames'))
  
          return {
              'id': song_id,
              'title': info['name'],
              'alt_title': alt_title,
              'creator': ' / '.join([artist['name'] for artist in info.get('artists', [])]),
              'timestamp': self.convert_milliseconds(info.get('album', {}).get('publishTime')),
              'thumbnail': info.get('album', {}).get('picUrl'),
              'duration': self.convert_milliseconds(info.get('duration', 0)),
              'description': lyrics,
              'formats': formats,
          }
  
  
  class NetEaseMusicAlbumIE(NetEaseMusicBaseIE):
      IE_NAME = 'netease:album'
      IE_DESC = '网易云音乐 - 专辑'
      _VALID_URL = r'https?://music\.163\.com/(#/)?album\?id=(?P<id>[0-9]+)'
      _TEST = {
          'url': 'http://music.163.com/#/album?id=220780',
          'info_dict': {
              'id': '220780',
              'title': 'B\'day',
          },
          'playlist_count': 23,
          'skip': 'Blocked outside Mainland China',
      }
  
      def _real_extract(self, url):
          album_id = self._match_id(url)
  
          info = self.query_api(
              'album/%s?id=%s' % (album_id, album_id),
              album_id, 'Downloading album data')['album']
  
          name = info['name']
          desc = info.get('description')
          entries = [
              self.url_result('http://music.163.com/#/song?id=%s' % song['id'],
                              'NetEaseMusic', song['id'])
              for song in info['songs']
          ]
          return self.playlist_result(entries, album_id, name, desc)
  
  
  class NetEaseMusicSingerIE(NetEaseMusicBaseIE):
      IE_NAME = 'netease:singer'
      IE_DESC = '网易云音乐 - 歌手'
      _VALID_URL = r'https?://music\.163\.com/(#/)?artist\?id=(?P<id>[0-9]+)'
      _TESTS = [{
          'note': 'Singer has aliases.',
          'url': 'http://music.163.com/#/artist?id=10559',
          'info_dict': {
              'id': '10559',
              'title': '张惠妹 - aMEI;阿密特',
          },
          'playlist_count': 50,
          'skip': 'Blocked outside Mainland China',
      }, {
          'note': 'Singer has translated name.',
          'url': 'http://music.163.com/#/artist?id=124098',
          'info_dict': {
              'id': '124098',
              'title': '李昇基 - 이승기',
          },
          'playlist_count': 50,
          'skip': 'Blocked outside Mainland China',
      }]
  
      def _real_extract(self, url):
          singer_id = self._match_id(url)
  
          info = self.query_api(
              'artist/%s?id=%s' % (singer_id, singer_id),
              singer_id, 'Downloading singer data')
  
          name = info['artist']['name']
          if info['artist']['trans']:
              name = '%s - %s' % (name, info['artist']['trans'])
          if info['artist']['alias']:
              name = '%s - %s' % (name, ';'.join(info['artist']['alias']))
  
          entries = [
              self.url_result('http://music.163.com/#/song?id=%s' % song['id'],
                              'NetEaseMusic', song['id'])
              for song in info['hotSongs']
          ]
          return self.playlist_result(entries, singer_id, name)
  
  
  class NetEaseMusicListIE(NetEaseMusicBaseIE):
      IE_NAME = 'netease:playlist'
      IE_DESC = '网易云音乐 - 歌单'
      _VALID_URL = r'https?://music\.163\.com/(#/)?(playlist|discover/toplist)\?id=(?P<id>[0-9]+)'
      _TESTS = [{
          'url': 'http://music.163.com/#/playlist?id=79177352',
          'info_dict': {
              'id': '79177352',
              'title': 'Billboard 2007 Top 100',
              'description': 'md5:12fd0819cab2965b9583ace0f8b7b022'
          },
          'playlist_count': 99,
          'skip': 'Blocked outside Mainland China',
      }, {
          'note': 'Toplist/Charts sample',
          'url': 'http://music.163.com/#/discover/toplist?id=3733003',
          'info_dict': {
              'id': '3733003',
              'title': 're:韩国Melon排行榜周榜 [0-9]{4}-[0-9]{2}-[0-9]{2}',
              'description': 'md5:73ec782a612711cadc7872d9c1e134fc',
          },
          'playlist_count': 50,
          'skip': 'Blocked outside Mainland China',
      }]
  
      def _real_extract(self, url):
          list_id = self._match_id(url)
  
          info = self.query_api(
              'playlist/detail?id=%s&lv=-1&tv=-1' % list_id,
              list_id, 'Downloading playlist data')['result']
  
          name = info['name']
          desc = info.get('description')
  
          if info.get('specialType') == 10:  # is a chart/toplist
              datestamp = datetime.fromtimestamp(
                  self.convert_milliseconds(info['updateTime'])).strftime('%Y-%m-%d')
              name = '%s %s' % (name, datestamp)
  
          entries = [
              self.url_result('http://music.163.com/#/song?id=%s' % song['id'],
                              'NetEaseMusic', song['id'])
              for song in info['tracks']
          ]
          return self.playlist_result(entries, list_id, name, desc)
  
  
  class NetEaseMusicMvIE(NetEaseMusicBaseIE):
      IE_NAME = 'netease:mv'
      IE_DESC = '网易云音乐 - MV'
      _VALID_URL = r'https?://music\.163\.com/(#/)?mv\?id=(?P<id>[0-9]+)'
      _TEST = {
          'url': 'http://music.163.com/#/mv?id=415350',
          'info_dict': {
              'id': '415350',
              'ext': 'mp4',
              'title': '이럴거면 그러지말지',
              'description': '白雅言自作曲唱甜蜜爱情',
              'creator': '白雅言',
              'upload_date': '20150520',
          },
          'skip': 'Blocked outside Mainland China',
      }
  
      def _real_extract(self, url):
          mv_id = self._match_id(url)
  
          info = self.query_api(
              'mv/detail?id=%s&type=mp4' % mv_id,
              mv_id, 'Downloading mv info')['data']
  
          formats = [
              {'url': mv_url, 'ext': 'mp4', 'format_id': '%sp' % brs, 'height': int(brs)}
              for brs, mv_url in info['brs'].items()
          ]
          self._sort_formats(formats)
  
          return {
              'id': mv_id,
              'title': info['name'],
              'description': info.get('desc') or info.get('briefDesc'),
              'creator': info['artistName'],
              'upload_date': info['publishTime'].replace('-', ''),
              'formats': formats,
              'thumbnail': info.get('cover'),
              'duration': self.convert_milliseconds(info.get('duration', 0)),
          }
  
  
  class NetEaseMusicProgramIE(NetEaseMusicBaseIE):
      IE_NAME = 'netease:program'
      IE_DESC = '网易云音乐 - 电台节目'
      _VALID_URL = r'https?://music\.163\.com/(#/?)program\?id=(?P<id>[0-9]+)'
      _TESTS = [{
          'url': 'http://music.163.com/#/program?id=10109055',
          'info_dict': {
              'id': '10109055',
              'ext': 'mp3',
              'title': '不丹足球背后的故事',
              'description': '喜马拉雅人的足球梦 ...',
              'creator': '大话西藏',
              'timestamp': 1434179342,
              'upload_date': '20150613',
              'duration': 900,
          },
          'skip': 'Blocked outside Mainland China',
      }, {
          'note': 'This program has accompanying songs.',
          'url': 'http://music.163.com/#/program?id=10141022',
          'info_dict': {
              'id': '10141022',
              'title': '25岁，你是自在如风的少年<27°C>',
              'description': 'md5:8d594db46cc3e6509107ede70a4aaa3b',
          },
          'playlist_count': 4,
          'skip': 'Blocked outside Mainland China',
      }, {
          'note': 'This program has accompanying songs.',
          'url': 'http://music.163.com/#/program?id=10141022',
          'info_dict': {
              'id': '10141022',
              'ext': 'mp3',
              'title': '25岁，你是自在如风的少年<27°C>',
              'description': 'md5:8d594db46cc3e6509107ede70a4aaa3b',
              'timestamp': 1434450841,
              'upload_date': '20150616',
          },
          'params': {
              'noplaylist': True
          },
          'skip': 'Blocked outside Mainland China',
      }]
  
      def _real_extract(self, url):
          program_id = self._match_id(url)
  
          info = self.query_api(
              'dj/program/detail?id=%s' % program_id,
              program_id, 'Downloading program info')['program']
  
          name = info['name']
          description = info['description']
  
          if not self._yes_playlist(info['songs'] and program_id, info['mainSong']['id']):
              formats = self.extract_formats(info['mainSong'])
              self._sort_formats(formats)
  
              return {
                  'id': info['mainSong']['id'],
                  'title': name,
                  'description': description,
                  'creator': info['dj']['brand'],
                  'timestamp': self.convert_milliseconds(info['createTime']),
                  'thumbnail': info['coverUrl'],
                  'duration': self.convert_milliseconds(info.get('duration', 0)),
                  'formats': formats,
              }
  
          song_ids = [info['mainSong']['id']]
          song_ids.extend([song['id'] for song in info['songs']])
          entries = [
              self.url_result('http://music.163.com/#/song?id=%s' % song_id,
                              'NetEaseMusic', song_id)
              for song_id in song_ids
          ]
          return self.playlist_result(entries, program_id, name, description)
  
  
  class NetEaseMusicDjRadioIE(NetEaseMusicBaseIE):
      IE_NAME = 'netease:djradio'
      IE_DESC = '网易云音乐 - 电台'
      _VALID_URL = r'https?://music\.163\.com/(#/)?djradio\?id=(?P<id>[0-9]+)'
      _TEST = {
          'url': 'http://music.163.com/#/djradio?id=42',
          'info_dict': {
              'id': '42',
              'title': '声音蔓延',
              'description': 'md5:766220985cbd16fdd552f64c578a6b15'
          },
          'playlist_mincount': 40,
          'skip': 'Blocked outside Mainland China',
      }
      _PAGE_SIZE = 1000
  
      def _real_extract(self, url):
          dj_id = self._match_id(url)
  
          name = None
          desc = None
          entries = []
          for offset in compat_itertools_count(start=0, step=self._PAGE_SIZE):
              info = self.query_api(
                  'dj/program/byradio?asc=false&limit=%d&radioId=%s&offset=%d'
                  % (self._PAGE_SIZE, dj_id, offset),
                  dj_id, 'Downloading dj programs - %d' % offset)
  
              entries.extend([
                  self.url_result(
                      'http://music.163.com/#/program?id=%s' % program['id'],
                      'NetEaseMusicProgram', program['id'])
                  for program in info['programs']
              ])
  
              if name is None:
                  radio = info['programs'][0]['radio']
                  name = radio['name']
                  desc = radio['desc']
  
              if not info['more']:
                  break
  
          return self.playlist_result(entries, dj_id, name, desc)
  